/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.fabric.planning

object Columns {

  def combine(left: Seq[String], right: Seq[String]): Seq[String] =
    left.filterNot(right.contains) ++ right

  def paramName(varName: String): String =
    s"@@$varName"

  def asParamMappings(varNames: Seq[String]): Map[String, String] =
    varNames.map(varName => varName -> paramName(varName)).toMap
}
